30212129 has 2 divisors, whose sum is σ = 30212130.
Its totient is φ = 30212128.
The previous prime is 30212093. The next prime is 30212131. The reversal of 30212129 is 92121203.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 16321600 + 13890529 = 4040^2 + 3727^2
It is an emirp because it is prime and its reverse (92121203) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 30212129 - 212 = 30208033 is a prime.
Together with 30212131, it forms a pair of twin primes.
It is a Chen prime.
It is a self number, because there is not a number n which added to its sum of digits gives 30212129.
It is not a weakly prime, because it can be changed into another prime (30212929) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15106064 + 15106065.
It is an arithmetic number, because the mean of its divisors is an integer number (15106065).
Almost surely, 230212129 is an apocalyptic number.
It is an amenable number.
30212129 is a deficient number, since it is larger than the sum of its proper divisors (1).
30212129 is an equidigital number, since it uses as much as digits as its factorization.
30212129 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 216, while the sum is 20.
The square root of 30212129 is about 5496.5561035980.
The cubic root of 30212129 is about 311.4539024029.
The spelling of 30212129 in words is "thirty million, two hundred twelve thousand, one hundred twenty-nine".